adj. imprevisto

The following video provides you with the correct English pronunciation of the word "unplanned", to help you become a better English speaker.

sin programar, no programado, imprevisto, espontáneo, intempestivo, sin planificar

No planeado

(adj.) = espontáneo, no planificado, sin planificar.
Ex: In fact, it is exactly these unplanned events that give him an insight into the country which he could not get from written sources.